5.0.0
cmake: Improve configuration
cmake: remove custom CheckCCompilerFlag/CheckCXXCompilerFlag
Added more missing license headers
cmake: improve configuration, prefer find_package instead of PKG_CONFIG for leptonica and tiff
cmake: add detection of AVX, AVX2, SSE41
replace VS implementation of gettimeofday with std::chrono::steady_clock::now(); fixes #2038